third-party-mirror / mingw-w64 / 063fb9eda93b76f6715cee4894a2dc19323f13bd / . / mingw-w64-crt / math / DFP / dfp_internal.h

/* | |

This Software is provided under the Zope Public License (ZPL) Version 2.1. | |

Copyright (c) 2009 - 2013 by the mingw-w64 project | |

See the AUTHORS file for the list of contributors to the mingw-w64 project. | |

This license has been certified as open source. It has also been designated | |

as GPL compatible by the Free Software Foundation (FSF). | |

Redistribution and use in source and binary forms, with or without | |

modification, are permitted provided that the following conditions are met: | |

1. Redistributions in source code must retain the accompanying copyright | |

notice, this list of conditions, and the following disclaimer. | |

2. Redistributions in binary form must reproduce the accompanying | |

copyright notice, this list of conditions, and the following disclaimer | |

in the documentation and/or other materials provided with the | |

distribution. | |

3. Names of the copyright holders must not be used to endorse or promote | |

products derived from this software without prior written permission | |

from the copyright holders. | |

4. The right to distribute this software or to use it for any purpose does | |

not give you the right to use Servicemarks (sm) or Trademarks (tm) of | |

the copyright holders. Use of them is covered by separate agreement | |

with the copyright holders. | |

5. If any files are modified, you must cause the modified files to carry | |

prominent notices stating that you changed the files and the date of | |

any change. | |

Disclaimer | |

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY EXPRESSED | |

OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |

OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO | |

EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT, | |

INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |

LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, | |

OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |

LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |

NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, | |

EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |

*/ | |

#ifndef __STDC_WANT_DEC_FP__ | |

#define __STDC_WANT_DEC_FP__ 1 | |

#endif | |

#include <math.h> | |

#include <fenv.h> | |

#include <errno.h> | |

#include <inttypes.h> | |

#ifndef _MSC_VER | |

#ifndef __DECIMAL_BID_FORMAT__ | |

#error Only BID DFP supported! | |

#endif | |

#if (__BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__) || (__FLOAT_WORD_ORDER__ != __ORDER_LITTLE_ENDIAN__) | |

#error Only little endian supported! | |

#endif | |

#endif /* _MSC_VER */ | |

/* We need to check the BID encoding format | |

_Decimal32: | |

MSB-----------------------------------------------------------------LSB | |

s | 00eeeeee |(0)TTTtttttttttttttttttttt | | |

[sign bit]|[ proble bits must not be "11"]|[Implicit "0" MSB] | | |

|[ 8-bit exponent, "00" probed ]|[23-bit True Siginifcant ]| | |

If probed bits form "11" exponent is 10-bits instead of 8-bits. | |

s | 11 00eeeeee |(100) Ttttttttttttttttttttt | | |

[sign bit]|["11" proble bits ]| | | |

|[ 10-bit exponent ]|[Implicit "100" as MSB] | | |

| |[21-bit True Significant ]| | |

DFP = -1^s x tttt x [ 10 ^ (eeee - (101(base10))] | |

Use type0d32 to probe the 2 bits, if not 11, use type1d32, else use type2d32. | |

The 11 bits are ignored when computing exponents. | |

Examples: | |

s 00eeeeee (0)TTTtttttttttttttttttttt | |

s 01eeeeee (0)TTTtttttttttttttttttttt | |

s 10eeeeee (0)TTTtttttttttttttttttttt | |

s 11 01eeeeee (100)Ttttttttttttttttttttt | |

s 11 10eeeeee (100)Ttttttttttttttttttttt | |

NAN types: | |

s 11110 xxxxxxxxxxxxxxxxxxxxxxxxxx +-Infinity | |

s 111110 xxxxxxxxxxxxxxxxxxxxxxxxx quiet NaN | |

s 111111 xxxxxxxxxxxxxxxxxxxxxxxxx signaling NaN | |

_Decimal64: | |

s 00eeeeeeee TTTtttttttttttttttttttt tttttttttttttttttttttttttttttt | |

s 01eeeeeeee TTTtttttttttttttttttttt tttttttttttttttttttttttttttttt | |

s 10eeeeeeee TTTtttttttttttttttttttt tttttttttttttttttttttttttttttt | |

s 11 00eeeeeeee (100)Ttttttttttttttttttttt tttttttttttttttttttttttttttttt | |

s 11 01eeeeeeee (100)Ttttttttttttttttttttt tttttttttttttttttttttttttttttt | |

s 11 10eeeeeeee (100)Ttttttttttttttttttttt tttttttttttttttttttttttttttttt | |

DFP = -1^s x tttt x [ 10 ^ (eeee - (398(base10))] | |

_Decimal128: | |

s 00eeeeeeeeeeee TTTtttttttttttttttttttt tttttttttttttttttttttttttttttt tttttttttttttttttttttttttttttttttttttttttttttttttttttttt | |

s 01eeeeeeeeeeee TTTtttttttttttttttttttt tttttttttttttttttttttttttttttt tttttttttttttttttttttttttttttttttttttttttttttttttttttttt | |

s 10eeeeeeeeeeee TTTtttttttttttttttttttt tttttttttttttttttttttttttttttt tttttttttttttttttttttttttttttttttttttttttttttttttttttttt | |

s 11 00eeeeeeeeeeee (100)Ttttttttttttttttttttt tttttttttttttttttttttttttttttt tttttttttttttttttttttttttttttttttttttttttttttttttttttttt | |

s 11 01eeeeeeeeeeee (100)Ttttttttttttttttttttt tttttttttttttttttttttttttttttt tttttttttttttttttttttttttttttttttttttttttttttttttttttttt | |

s 11 10eeeeeeeeeeee (100)Ttttttttttttttttttttt tttttttttttttttttttttttttttttt tttttttttttttttttttttttttttttttttttttttttttttttttttttttt | |

DFP = -1^s x tttt x [ 10 ^ (eeee - (6176(base10))] | |

*/ | |

#include <pshpack1.h> | |

#ifdef __GNUC__ | |

#define structpack __attribute__((gcc_struct)) | |

#else | |

#define structpack | |

#endif | |

typedef struct structpack type0d32 { | |

uint64_t blob:25; | |

uint32_t flag:4; | |

uint32_t bits:2; | |

uint32_t sign:1; | |

} type0d32; | |

/* case not 11 */ | |

typedef struct structpack type1d32 { | |

uint64_t mantissa:23; | |

uint32_t exponent:8; | |

uint32_t sign:1; | |

} type1d32; | |

/* case 11 */ | |

typedef struct structpack type2d32 { | |

/* implicit (100) MSB for mantissa */ | |

uint64_t mantissa:21; | |

uint32_t exponent:8; | |

uint32_t bits:2; | |

uint32_t sign:1; | |

} type2d32; | |

typedef struct structpack type0d64 { | |

uint64_t blob:57; | |

uint32_t flag:4; | |

uint32_t bits:2; | |

uint32_t sign:1; | |

} type0d64; | |

/* case not 11 */ | |

typedef struct structpack type1d64 {; | |

uint64_t mantissa:53; | |

uint32_t exponent:10; | |

uint32_t sign:1; | |

} type1d64; | |

/* case 11 */ | |

typedef struct structpack type2d64 { | |

/* implicit (100) MSB for mantissa */ | |

uint64_t mantissa:51; | |

uint32_t exponent:10; | |

uint32_t bits:2; | |

uint32_t sign:1; | |

} type2d64; | |

typedef struct structpack type0d128 { | |

uint64_t blobL:64; | |

uint64_t blobH:57; | |

uint32_t flag:4; | |

uint32_t bits:2; | |

uint32_t sign:1; | |

} type0d128; | |

/* case not 11 */ | |

typedef struct structpack type1d128 { | |

uint64_t mantissaL:64; | |

uint64_t mantissaH:49; | |

uint32_t exponent:14; | |

uint32_t sign:1; | |

} type1d128; | |

/* case 11 */ | |

typedef struct structpack type2d128 { | |

uint64_t mantissaL:64; | |

/* implicit (100) MSB for mantissa */ | |

uint64_t mantissaH:47; | |

uint32_t exponent:14; | |

uint32_t bits:2; | |

uint32_t sign:1; | |

} type2d128; | |

#ifdef _MSC_VER | |

typedef type0d32 _Decimal32; | |

typedef type0d64 _Decimal64; | |

typedef type0d128 _Decimal128; | |

#endif /* _MSC_VER */ | |

#include <poppack.h> | |

typedef union ud32 { | |

_Decimal32 d; | |

type0d32 t0; | |

type1d32 t1; | |

type2d32 t2; | |

unsigned char b[sizeof(_Decimal32)]; | |

} ud32; | |

typedef union ud64 { | |

_Decimal64 d; | |

type0d64 t0; | |

type1d64 t1; | |

type2d64 t2; | |

unsigned char b[sizeof(_Decimal64)]; | |

} ud64; | |

typedef union ud128 { | |

_Decimal128 d; | |

type0d128 t0; | |

type1d128 t1; | |

type2d128 t2; | |

unsigned char b[sizeof(_Decimal128)]; | |

} ud128; |